Adistance of 1.0 meter separates the centers of
two small charged spheres. the spheres exert
gravitational force f
g and electrostatic force fe on
each other. if the distance between the spheres’
centers is increased to 3.0 meters, the
gravitational force and electrostatic force,
respectively, may be represented as
(1) (3) 3f
g and 3fe
(2) (4) 9fg and 9fe

You are sitting on the beach and wondering about the properties of mechanical waves. describe them in terms of ocean waves.

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.